PIRSA:22110078

# Counting the microstates of the cosmic horizon

### APA

Shyam, V. (2022). Counting the microstates of the cosmic horizon. Perimeter Institute. https://pirsa.org/22110078

### MLA

Shyam, Vasudev. Counting the microstates of the cosmic horizon. Perimeter Institute, Nov. 10, 2022, https://pirsa.org/22110078

### BibTex

          @misc{ pirsa_22110078,
doi = {10.48660/22110078},
url = {https://pirsa.org/22110078},
author = {Shyam, Vasudev},
keywords = {Quantum Gravity},
language = {en},
title = {Counting the microstates of the cosmic horizon},
publisher = {Perimeter Institute},
year = {2022},
month = {nov},
note = {PIRSA:22110078 see, \url{https://pirsa.org}}
}


Vasudev Shyam Stanford University

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## Abstract

I will describe a holographic model for the three dimensional de Sitter static patch where the boundary theory is the so called $T\bar{T}+\Lambda_2$ deformation of the conformal field theory dual to AdS_3 quantum gravity. This identification allows us to obtain the cosmic horizon entropy from a microstate count, and the microstates themselves are a dressed version of those that account for the entropy of certain black holes in AdS space. I will also show how the effect of this dressing at the cosmic horizon is to replace the spacetime dependence of the fields of the undeformed holographic CFT with dependence on the indices of large matrices.